CN216182183U

CN216182183U - Liquid silica gel cover forming system suitable for making large-thickness silica gel injection molding product

Info

Publication number: CN216182183U
Application number: CN202122362020.1U
Authority: CN
Inventors: 高耀祖; 袁广杰; 孙国伟
Original assignee: Hong Kong Productivity Council
Current assignee: Hong Kong Productivity Council
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-04-05
Anticipated expiration: 2031-09-28

Abstract

The utility model provides a liquid silica gel covering and forming system suitable for manufacturing large-thickness silica gel injection molding products, which comprises: the device comprises a forming mould, a control device, a heating device, an opening and closing and rotating driving device and two groups of liquid silica gel injection devices, wherein the heating device, the opening and closing and rotating driving device and the two groups of liquid silica gel injection devices are electrically connected with the control device; wherein, the heating device is arranged on the forming die; the forming die is provided with at least two die cavities and two liquid silica gel injection ports which are positioned at different positions of the forming die and are respectively communicated with the at least two die cavities; the forming die is arranged on the opening and closing and rotating driving device and is driven by the opening and closing and rotating driving device to be opened, closed or rotated; the two groups of liquid silica gel injection devices are arranged corresponding to the two liquid silica gel injection ports, and the two groups of liquid silica gel injection devices can respectively inject the liquid silica gel into the at least two die cavities through the two liquid silica gel injection ports. Therefore, the production time of the liquid silica gel part with the thickness of more than 5mm can be effectively shortened, and the full automation of the production process can be realized.

Description

Liquid silica gel cover forming system suitable for making large-thickness silica gel injection molding product

Technical Field

The utility model relates to the technical field of liquid silica gel cover forming, in particular to a liquid silica gel cover forming system suitable for manufacturing large-thickness silica gel injection molding products.

Background

The injection molding and overmolding technology generally refers to a technology in which two or more plastic materials are injected on an injection molding machine and molded twice or more, and an injection molded product is taken out of one set of mold and then placed in another set of mold for secondary injection molding. Generally, two plastic materials are required to be injected on two injection molding machines, and therefore, the above molding process is usually completed by two sets of molds, thereby causing problems of high cost and low yield.

Liquid silica gel is in a liquid state at room temperature, and the liquid silica gel for manufacturing injection molded products generally comprises two components, namely glue A and glue B. The a and B glues must be thoroughly mixed to set at high temperature (e.g., 140 ℃). In the injection molding process, the liquid silica gel feeding system extracts the glue A and the glue B in a ratio of 1:1, mixes the glue A and the glue B through a static mixer, injects the mixed liquid silica gel into a hot mold cavity to solidify the mixed liquid silica gel, and gradually solidifies the liquid silica gel to form a product. The curing time of the liquid silicone gel will vary depending on the thickness and shape of the article and the curing temperature, and at 150 c, when an article having a thickness of about 1mm is formed, the curing time is generally within 30 seconds, whereas if the article is thicker (e.g., greater than 5mm), a longer curing time, e.g., greater than 5 minutes, is required. Longer curing times can result in longer product cycle times, which can increase machine investment and labor costs to maintain throughput.

Therefore, how to design a liquid silica gel overmolding system that can shorten the production cycle, reduce the machine investment cost, reduce the labor cost investment, and realize the full-automatic production control has become one of the technical problems to be solved in the art.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the technical scheme is how to provide a full-automatic production control liquid silica gel over-molding system, so that a liquid silica gel product with large thickness is divided into a plurality of layers in the process of molding the product and is matched with a secondary over-molding technology, the curing time of the liquid silica gel is shortened, and the production period of the molded product is effectively shortened.

In order to solve the above technical problem, this technical scheme provides a liquid silica gel cover forming system suitable for making big thickness silica gel injection molding, and it includes: the device comprises a forming mould, a control device, a heating device, an opening and closing and rotating driving device and two groups of liquid silica gel injection devices, wherein the heating device, the opening and closing and rotating driving device and the two groups of liquid silica gel injection devices are electrically connected with the control device; wherein, the heating device is arranged on the forming die; the forming mold is provided with at least two mold cavities and two liquid silica gel injection ports which are positioned at different positions of the forming mold and are respectively communicated with the at least two mold cavities; the forming mould is arranged on the opening and closing and rotating driving device and can be driven by the opening and closing and rotating driving device to be opened, closed or rotated; the two groups of liquid silica gel injection devices are arranged corresponding to the two liquid silica gel injection ports, and the two groups of liquid silica gel injection devices can inject the liquid silica gel into the at least two die cavities through the two liquid silica gel injection ports respectively. Therefore, the heating device can heat the forming mold through the control of the control device, and the opening and closing and rotation driving device is matched with the synchronous injection molding operation of the two groups of liquid silica gel injection devices to drive the forming mold to periodically operate in an opening, rotation and closing manner, so that the liquid silica gel product with large thickness is divided into a plurality of layers and a secondary covering forming technology is applied to carry out full-automatic liquid silica gel covering forming operation, the curing time of the liquid silica gel forming product is effectively shortened, and the production period of the forming product is reduced; in addition, the structure of the liquid silica gel covering and forming system can be optimized, so that the input scale and the investment cost of a machine device can be reduced, the input of labor cost can be reduced, and the economic benefit is increased.

As another implementation of the technical scheme, the forming die can be composed of a male die positioned in the middle and female dies positioned on two sides of the male die; the at least two cavities are symmetrically formed between the male die and the female dies on both sides of the male die.

As another implementation of the technical scheme, the opening, closing and rotation driving device is composed of an opening and closing frame body, a rotary table and a driving unit, wherein two plate bodies of the opening and closing frame body are respectively combined with female dies on two sides of a male die, the rotary table is combined with one side surface of the male die, which is not provided with a die cavity, and the driving unit is electrically connected with a control device; the driving unit drives the opening and closing frame body to enable the two plate bodies to drive the female dies on the two sides of the male die to be separated from or connected with the male die; and the driving unit drives the turntable to enable the male die to rotate in a state of being separated from the female die, so that two sides of the male die, which are provided with the die cavities, are exchanged. With this structure, the position rotation adjustment is conveniently carried out to the terrace die that covers the product in the process of making the injection molding product, so as to ensure the smooth operation of secondary covering molding.

As another implementation of the technical scheme, the forming die can also be composed of a male die and a female die; the at least two cavities are symmetrically formed between the male die and the female die.

As another implementation of the technical scheme, the opening, closing and rotating driving device comprises a turntable, an opening and closing frame body and a driving unit, wherein the turntable is combined on the side surface of the male die opposite to the side surface on which the die cavity is formed, two plate bodies of the opening and closing frame body are respectively combined with the turntable and the female die, and the driving unit is electrically connected with the control device; the driving unit drives the opening and closing frame body to enable the two plate bodies to drive the male die and the female die to be separated or jointed; the turntable is driven by the driving unit to enable the male die to rotate in a state of being separated from the female die, so that the positions of the male die with at least two die cavities are exchanged. With this structure, also can be convenient for cover the terrace die that has the goods in-process to make injection moulding goods and carry out position rotation adjustment to guarantee that secondary cover shaping operation goes on smoothly.

As another implementation of the technical solution, the liquid silica gel injection device is composed of a liquid silica gel feeding unit, a mixing valve, a static mixer and a liquid silica gel injection platform which are sequentially connected through a pipeline, and the mixing valve and the liquid silica gel injection platform are respectively electrically connected with the control device. Therefore, the control device can control the mixing and injection molding operation of the liquid silica gel.

As another implementation of the technical scheme, the liquid silica gel feeding unit is provided with two feeding cavities, two raw materials with different components are stored in the two feeding cavities respectively, and the two feeding cavities are connected with the mixing valve through pipelines respectively.

As another implementation of the present technical solution, the liquid silicone gel overmolding system may further include: the temperature controller is electrically connected with the control device; the temperature controller is used for measuring the temperatures of the at least two die cavities so as to control the heating device to heat or cool the forming die through the control device. Thus, the heating temperature of the heating device can be dynamically adjusted according to the actual temperature of the mold cavity, thereby providing a stable curing temperature for the injection molded product.

As another implementation of the present solution, the temperature controller includes: a thermocouple temperature gauge; the thermocouple temperature measuring meter is arranged in the die cavity and electrically connected with the temperature controller so as to transmit measured temperature data to the temperature controller.

As another implementation of the present technical solution, the liquid silicone rubber overmolding system further includes: the vacuum pump is electrically connected with the control device; the vacuum pump is respectively communicated with the at least two die cavities through pipelines. The vacuum pump may create a negative pressure within the mold cavity, thereby facilitating the mold filling process.

Drawings

FIG. 1 is a schematic view of a liquid silicone gel overmolding system suitable for making large-thickness silicone gel injection molded articles according to the utility model;

FIG. 2 is a schematic diagram illustrating steps of a secondary overmolding operation performed by the molding die in an embodiment of the utility model;

FIG. 3 is a schematic diagram of the steps of a secondary overmolding operation performed by a molding die in another embodiment of the utility model.

Symbolic illustration in the drawings:

1, a liquid silica gel covering and forming system; 2. 2' forming a mould; 21. 21' a male die; 22. 22' female die; 23. 23' a mold cavity; 3. 3' opening and closing and rotating driving device; 31. 31' opening and closing the frame body; 32. 32' plate body; 33' a turntable; 4 liquid silica gel injection device; 41 liquid silica gel feeding unit; 411 feed volume; 42 a mixing valve; 43 a static mixer; 44 liquid silica gel injection platform; 5 a temperature controller; 6 vacuum pump.

Detailed Description

The following detailed description and technical contents of the present invention are described with reference to the drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.

Fig. 1 is a schematic view of a liquid silicone rubber overmolding system (hereinafter referred to as liquid silicone rubber overmolding system) suitable for manufacturing a large-thickness silicone rubber injection molded product according to an embodiment of the utility model. The liquid silica gel overmolding system 1 includes a molding mold 2, a control device (not shown), a heating device (not shown) electrically connected to the control device, an opening/closing and rotation driving device 3, and two liquid silica gel injection devices 4. The control device may be composed of a control circuit having an MCU (micro control unit) and a memory, or a programmable logic control circuit (PLC), etc., and the automated control system composed of the above control device is currently used in many fields, so detailed descriptions of the structure and control method of the control device are omitted in the present invention. The heating device is installed on the forming mold 2, and the heating device may be composed of an electromagnetic induction heating element, a resistance heating element, and the like. The forming mold 2 has at least two mold cavities 23 and two liquid silicone injection ports (not shown) located at different positions of the forming mold 2 and respectively communicated with the at least two mold cavities 23, which are exemplified as having two mold cavities 23 in the present invention, but in practical implementation, in order to improve the production efficiency of injection molded products, the number of the mold cavities can be increased, such as four, six, eight, etc. The forming mold 2 is installed on the opening and closing and rotation driving device 3, and under the control of the control device, the opening and closing and rotation driving device 3 drives the forming mold 2 to open or close or rotate in cooperation with the injection molding operation of the two groups of liquid silica gel injection devices 4. The two groups of liquid silicone injection devices 4 are arranged corresponding to the two liquid silicone injection ports, and can inject the liquid silicone into the at least two mold cavities 23 through the two liquid silicone injection ports respectively under the control of the control device.

More specifically, as shown in fig. 1, the liquid silica gel injection device 4 is composed of a liquid silica gel supply unit 41, a mixing valve 42, a static mixer 43 and a liquid silica gel injection platform 44 which are sequentially connected through a pipeline, and the mixing valve 42 and the liquid silica gel injection platform 44 are respectively electrically connected with a control device. The liquid silica gel supply unit 41 has two supply cavities 411, two raw materials with different components are stored in the two supply cavities 411 respectively, and the two supply cavities 411 are connected with the mixing valve 42 through pipelines respectively. The liquid silicone rubber injection device 4 can perform the mixing and injection molding operations of the liquid silicone rubber under the control of the control device. In addition, the liquid silicone rubber overmolding system 1 may further include a temperature controller 5 electrically connected to the control device, and the temperature controller 5 may be formed by a Programmable Logic Controller (PLC), where the temperature controller 5 obtains real-time temperature data of the mold cavity 23 through a thermocouple temperature meter (not shown) electrically connected to the mold cavity 23, and determines whether temperature rise or temperature fall is required by comparing the real-time temperature data with a stored temperature set value, and adjusts output power of the heating device through the control device, so as to implement temperature rise or temperature fall operation on the molding mold 2. The use of the temperature controller 5 allows the heating temperature of the heating means to be dynamically adjusted according to the actual temperature of the mold cavity 23, thereby providing a stable curing temperature for the injection molded article. In addition, the liquid silicone rubber overmolding system 1 may further include a vacuum pump 6 electrically connected to the control device, and the vacuum pump 6 is respectively communicated with the at least two mold cavities 23 through a pipeline. The vacuum pump 6 may generate a negative pressure within the mold cavity 23, thereby facilitating the mold filling process.

Fig. 2 is a schematic view showing the steps of the secondary overmolding operation performed by the molding die in the above-described embodiment. The forming mold 2 may be composed of a punch 21 located in the middle and a die 22 located on both sides of the punch 21. And the at least two cavities 23 are symmetrically formed between the male die 21 and the female dies 22 on both sides thereof. The opening and closing and rotation driving device 3 is composed of an opening and closing frame 31, a rotary table (not shown) and a driving unit (not shown), wherein two plate bodies 32 of the opening and closing frame 31 are respectively combined with the female dies 22 on two sides of the male die 21, the rotary table is combined with one side surface of the male die 21, which is not provided with the die cavity 23, the driving unit is electrically connected with a control device, and the driving unit can be composed of an air pressure telescopic rod or a hydraulic telescopic rod for driving the two plate bodies to move and a motor for driving the rotary table to rotate. The open-close frame body 31 is driven by the driving unit, so that the two plate bodies 32 drive the female dies 22 on the two sides of the male die 21 to be separated from or connected with the male die 21, and the rotary disc is driven by the driving unit, so that the male die 21 rotates in a state of being separated from (opened by) the female dies 22, and the two side surfaces of the male die 21, which are provided with the die cavities 23, are exchanged. The specific operation steps are explained in detail in conjunction with fig. 2(a) to (f): first, as shown in fig. 2(a), in a state that the opening/closing and rotation driving device 3 drives the male mold 21 and the female mold 22 of the forming mold 2 to be joined, at this time, the at least two cavities 23 are empty, and the primary liquid silicone injection device 4 in the two sets of liquid silicone injection devices 4 (hereinafter referred to as the primary liquid silicone injection device (left side in the drawing) and the secondary liquid silicone injection device (right side in the drawing) for the convenience of distinction) performs primary injection molding on the cavity 23 (one left side cavity in the drawing) at the corresponding position; as shown in fig. 2 (b), after the liquid silicone rubber in the cavity 23 after the primary injection molding is solidified, the opening and closing and rotation driving device 3 drives the male mold 21 to separate from the female mold 22, and then the male mold 21 is rotated to exchange the two side surfaces of the cavity 23; as shown in fig. 2 (c), the opening and closing and rotation driving device 3 drives the male mold 21 to be engaged with the female mold 22, the primary injection molding is performed on the mold cavity 23 at the corresponding position by the primary liquid silicone injection device 4, and the secondary covering injection molding is performed on the mold cavity 23 (the right mold cavity is shown in the figure) which has completed the primary injection molding by the secondary liquid silicone injection device 4; as shown in fig. 2 (d), after the liquid silicone rubber in the mold cavity 23 after the primary injection molding and the liquid silicone rubber in the mold cavity 23 after the secondary covering injection molding are both solidified, the opening and closing and rotation driving device 3 drives the male mold 21 and the female mold 22 to separate; as shown in fig. 2 (e), the molded article in the cavity 23 in which the secondary overmolding is completed is taken out, and thereafter the male mold 21 is rotated to exchange the two sides thereof where the cavity 23 is formed; as shown in fig. 2 (f), the operation steps shown in fig. 2 (c) are repeated; and then repeating the periodic injection molding operations shown in the steps 2 (d) to 2 (f) to divide the liquid silicone rubber product with large thickness into a plurality of layers (two layers in the embodiment) and performing full-automatic liquid silicone rubber overmolding operation by applying a secondary overmolding technology, thereby effectively shortening the curing time of the liquid silicone rubber molded product. The combined structure of the forming die and the opening, closing and rotating driving device is convenient for carrying out position rotation adjustment on the male die covered with the product in the process of manufacturing the injection molding product so as to ensure the smooth operation of secondary covering molding.

FIG. 3 is a schematic diagram of the steps of the secondary overmolding operation performed by the molding die in another embodiment of the utility model. In the present embodiment, only the coupling structure between the forming mold 2 'and the opening/closing and rotation driving device 3' is slightly different from the above-mentioned embodiments, and the other structures are the same. In this embodiment, the forming mold 2 ' may further include a punch 21 ' and a die 22 '. The at least two cavities 23 ' are symmetrically formed between the punch 21 ' and the die 22 '. The opening and closing and rotation driving device 3 'is composed of a rotary table 33', an opening and closing frame body 31 'and a driving unit (not shown), wherein the rotary table 33' is combined on the side surface of the punch 21 'opposite to the side surface on which the die cavity 23' is formed, two plate bodies 32 'of the opening and closing frame body 31' are respectively combined with the rotary table 33 'and the die cavity 22', the driving unit is electrically connected with a control device, and the driving unit can also be composed of an air pressure telescopic rod or a hydraulic telescopic rod for driving the two plate bodies to move and a motor for driving the rotary table to rotate. The opening and closing frame body 31 ' is driven by the driving unit, so that the two plate bodies 32 ' drive the male die 21 ' and the female die 22 ' to be separated or connected, and the rotary disc 33 ' is driven by the driving unit, so that the male die 21 ' rotates in a state of being separated (opened) from the female die 22 ', and the position of the male die 21 ' where at least two die cavities 23 ' are formed is exchanged. The specific operation steps are explained in detail in conjunction with fig. 3(a) to (f): first, as shown in fig. 3(a), in a state that the opening/closing and rotation driving device 3 'drives the male mold 21' and the female mold 22 'of the molding mold 2' to be engaged, at this time, the at least two cavities 23 'are empty, and the primary liquid silicone injection device 4 of the two sets of liquid silicone injection devices 4 (hereinafter referred to as the primary liquid silicone injection device (left side in the figure) and the secondary liquid silicone injection device (right side in the figure) for the convenience of distinction) performs primary injection molding on the cavity 23' (one cavity at the lower side in the figure) at the corresponding position; as shown in fig. 3 (b), after the liquid silicone rubber in the mold cavity 23 'after the primary injection molding is solidified, the opening and closing and rotation driving device 3' drives the male mold 21 'to separate from the female mold 22', and then the male mold 21 'is rotated to exchange the positions of at least two mold cavities 23' formed therein; as shown in fig. 3 (c), the male mold 21 ' is driven to be engaged with the female mold 22 ' by the opening and closing and rotation driving device 3 ', the primary injection molding is performed on the mold cavity 23 ' at the corresponding position by the primary liquid silicone injection device 4, and the secondary cover injection molding is performed on the mold cavity 23 ' (shown as the upper mold cavity in the figure) in which the primary injection molding is completed by the secondary liquid silicone injection device 4; as shown in fig. 3 (d), after the liquid silicone rubber in the mold cavity 23 ' in which the primary injection molding is completed and the liquid silicone rubber in the mold cavity 23 ' in which the secondary covering injection molding is completed are both solidified, the male mold 21 ' is driven to be separated from the female mold 22 ' by the opening and closing and rotation driving device 3 '; as shown in fig. 3 (e), the molded article in the cavity 23 ' in which the secondary overmolding is completed is taken out, and thereafter the position of the male mold 21 ' where at least two cavities 23 ' are formed is reversed; as shown in fig. 3 (f), the operation steps shown in fig. 3 (c) are repeated; and then repeating the periodic injection molding operations shown in 3 (d) to 3 (f), so that the liquid silicone rubber product with large thickness can be divided into a plurality of layers (two layers in the embodiment) and a full-automatic liquid silicone rubber covering molding operation is carried out by applying a secondary covering molding technology, thereby effectively shortening the curing time of the liquid silicone rubber molded product. The combined structure of the forming die and the opening and closing and rotation driving device can also facilitate the position rotation adjustment of the male die covered with the product in the process of manufacturing the injection molding product so as to ensure the smooth operation of secondary covering molding.

In summary, the heating device can heat the forming mold under the control of the control device, and the opening/closing and rotation driving device is matched with the synchronous injection molding operation of the two groups of liquid silica gel injection devices to drive the forming mold to periodically operate in an opening, rotation and closing manner, so that the liquid silica gel product with large thickness is divided into a plurality of layers and a secondary covering molding technology is applied to perform full-automatic liquid silica gel covering molding operation, thereby effectively shortening the curing time of the liquid silica gel molded product and reducing the production period of the molded product; in addition, the structure of the liquid silica gel covering and forming system can be optimized, so that the input scale and the investment cost of a machine device can be reduced, the input of labor cost can be reduced, and the economic benefit is increased.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalent changes made by applying the patent concepts of the present invention should fall within the scope of the present invention.

Claims

1. A liquid silicone rubber overmolding system suitable for making large-thickness silicone rubber injection molded articles, comprising: the device comprises a forming die, a control device and a heating device; the heating device is arranged on the forming die and is electrically connected with the control device; it is characterized by also comprising: the opening, closing and rotating driving device and the two groups of liquid silica gel injection devices are respectively electrically connected with the control device; the forming mold is provided with at least two mold cavities and two liquid silica gel injection ports which are positioned at different positions of the forming mold and are respectively communicated with the at least two mold cavities; the forming die is arranged on the opening and closing and rotating driving device and is driven by the opening and closing and rotating driving device to be opened, closed or rotated; two sets of liquid silica gel injection devices correspond two liquid silica gel injection ports set up, just two sets of liquid silica gel injection devices can with liquid silica gel respectively by two liquid silica gel injection ports inject into to in two at least mould intracavity.

2. The system for liquid silicone rubber overmolding according to claim 1, characterized in that the molding die is composed of a male die located in the middle and female dies located on both sides of the male die; the at least two die cavities are symmetrically formed between the male die and the female dies on two sides of the male die.

3. The liquid silicone rubber coating molding system of claim 2, wherein the opening and closing and rotation driving device is composed of an opening and closing frame body, a turntable and a driving unit, wherein two plate bodies of the opening and closing frame body are respectively combined with the female dies on two sides of the male die, the turntable is combined with one side surface of the male die, on which the die cavity is not formed, and the driving unit is electrically connected with the control device; the driving unit drives the opening and closing frame body to enable the two plate bodies to drive the female dies on the two sides of the male die to be separated from or connected with the male die; the driving unit drives the turntable to enable the male die to rotate in a state of being separated from the female die, so that two sides of the male die, which are provided with the die cavities, can be exchanged.

4. The liquid silicone rubber overmolding system according to claim 1, wherein the molding die is composed of a male die and a female die; the at least two die cavities are symmetrically formed between the male die and the female die.

5. The liquid silicone rubber coating molding system of claim 4, wherein the opening and closing and rotation driving device is composed of a turntable, an opening and closing frame body and a driving unit, the turntable is combined on the side surface of the male mold opposite to the side surface on which the mold cavity is formed, the two plate bodies of the opening and closing frame body are respectively combined with the turntable and the female mold, and the driving unit is electrically connected with the control device; the driving unit drives the opening and closing frame body to enable the two plate bodies to drive the male die and the female die to be separated or jointed; the turntable is driven by the driving unit to enable the male die to rotate in a state of being separated from the female die, so that the positions of the male die with at least two die cavities are exchanged.

6. The system according to claim 1, wherein the liquid silicone rubber injection device comprises a liquid silicone rubber supply unit, a mixing valve, a static mixer and a liquid silicone rubber injection platform which are sequentially connected through a pipeline, and the mixing valve and the liquid silicone rubber injection platform are respectively electrically connected with the control device.

7. The system for overmolding liquid silicone rubber according to claim 6, wherein the liquid silicone rubber supply unit has two supply cavities, the two supply cavities store two different compositions of raw materials, and the two supply cavities are connected to the mixing valve through pipelines.

8. The liquid silicone overmolding system according to claim 1, further comprising: the temperature controller is electrically connected with the control device; the temperature controller measures the temperatures of the at least two die cavities so as to control the heating device to heat or cool the forming die through the control device.

9. The liquid silicone overmolding system of claim 8, wherein the temperature controller comprises: a thermocouple temperature gauge; the thermocouple temperature measuring meter is arranged in the mold cavity and electrically connected with the temperature controller so as to transmit measured temperature data to the temperature controller.

10. The liquid silicone overmolding system according to claim 1, further comprising: the vacuum pump is electrically connected with the control device; the vacuum pump is respectively communicated with the at least two die cavities through pipelines.